SOLUTION: In a Gallup Survey, 90% of the people interviewed were unaware that maintaining a healthy weight could reduce the risk of stroke. If 15 people are selected at random, find the prob

Question 204452This question is from textbook elementary statistics
: In a Gallup Survey, 90% of the people interviewed were unaware that maintaining a healthy weight could reduce the risk of stroke. If 15 people are selected at random, find the probability that at least 9 are unaware that maintaining a proper weight could reduce the risk of stroke. This question is from textbook elementary statistics

Answer by stanbon(75887) (Show Source): You can put this solution on YOUR website!
In a Gallup Survey, 90% of the people interviewed were unaware that maintaining a healthy weight could reduce the risk of stroke. If 15 people are selected at random, find the probability that at least 9 are unaware that maintaining a proper weight could reduce the risk of stroke.
--------------
It's a binomial problem with n=15, p = 0.9, and 9<=x<=15
----
I used a TI calculator to get:
P(9<=x<=15) = 1 - binomcdf(15,0.9,8) = 0.999689
=============================
Cheers,
Stan H.
RELATED QUESTIONS
Could you please help me solve this Px 10. (4 pts) A survey of a group of people... (answered by stanbon)

The first week of a research study, 3,000 people were interviewed. The second week, 30%... (answered by Boreal)

In a recent survey among college students, it was found that 40% were graduates of public (answered by edjones)

does lovastatin reduce the risk of heart attack. In a texas study, (answered by Alan3354)

I just need to know if I got this answer correct. My answer is 53. Here is the problem. (answered by stanbon)

I try working this problem and I'm still having problem please show me the step thank you (answered by josmiceli)

please help thank so much. A survey of a group of people produced the following... (answered by Edwin McCravy)

A survey of a group of people produced the following results: there were 35 people with... (answered by rfer)

Gud afternoon.please be so kind to assist me with the following: 1.solve the following (answered by ankor@dixie-net.com)